6 – Coca-Cola Recipe Vault, United States

Nothing beats an ice cold Coca-Cola on a hot day, and millions around the world agree. The recipe for our favourite fizzy drink is one of the most closely guarded secrets in the world. There are claims that only two people know it at any given time and they can never travel on the same plane in case it crashes.

As a back up plan, just in case disaster did strike, the legendary mystery formula is secured in a vault in Atlanta. And you’d need more than a lock and key to get into it. The protected secret recipe is kept in a solid metal box inside a metal vault which is in a room protected by a security barrier. The area has high tech surveillance cameras throughout with 24 hour armed guards, and the door can only be opened via a hand scanner and secret code.

Whilst we may all love to know what makes Coca Cola taste so darn good we can be pretty certain it no longer contains the ingredient that everyone couldn’t get enough of pre 1903. Yes that’s right, before then each bottle of Coca-Cola would contain a hefty dose of cocaine! No wonder it perked you up.